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:) There are several ways to drain the system....If you have a fairly new boiler if may incorporate (in a sealed system) a pressure valve which can be opened to release the water ( only good if the radiatior in question is higher than the level of the bioler). The most common method is to...

:) This liquid to seal the radiators is mainly used for hairline (caperillery ?) leaks. It does a dam good job too, it is permanent although this doesnt mean its a replacment for shoddy work or leaks in the first place.